doNTreuse.sh is a simple Bash script for examining the extent of NT hash reuse from the result of Impacket's secretsdump.py. This is done by parsing the hashes, outputting groups separated by a delimiter containing all users who share the same password, and highlighting any administrators.
The tool is built to work with below format, but feel free to customize the regex for your needs.
<username>:<id>:<lm-hash>:<nt-hash>:::
./doNTreuse.sh ./hashes.txt ./admins.txt
Where "hashes.txt" is a list all hashes (one per line), and "admins.txt" is a list of all adminstrators (one per line).